Please help me with the first one first. /12/2017 Homework 3 A point charge (m 1

Question

Please help me with the first one first.

/12/2017 Homework 3 A point charge (m 1.4 g) at the end of an insulating string of length 55 cm i horizontal electric field of 9500 N/C, (vertical) position. s observed to be in equilibrium in a uniform when the pendulum's position is as shown in, with the charge 12 cm above the lowest L=55 cm In 12 cm Part A If the field points to the right in the figure, determine the magnitude of the point charge Express your answer to two significant figures and include the appropriate units. ANSWER: Part B Determine the sign of the point charge. ANSWER positive negative Score Summary: Your score on this assignment is 0.0%. You received 0 out of a possible total of 4 points. https: signmentPrintView?assignmentD-5667407 3/3

Explanation / Answer

here,

m = 0.014 kg

length , l = 0.55 m

horizontal electric feild , Ex = 9500 N/C

theta = arccos((55 - 12)/55)

theta = 38.6 degree

let the tension in the cable be T and charge be Q

equating the forces vertically

T * cos(theta) = m * g

T * cos(38.6) = 0.014 * 9.8

T = 0.18 N

equating the forces horizontally

T * sin(theta) = Q * E

0.18 * sin(38.6) = Q * 9500

Q = 1.15 * 10^-5 C

b)

as the force on charge is in the direction of feild

the charge is POSITIVELY CHARGED

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